All-time weather records — Swansea, IL

Record high
109.9°F
July 14, 1954
Record low
-27.0°F
January 17, 1977
Wettest day
8.15 in
June 15, 1957

Climate change signal in Swansea

12.3%

of Swansea's all-time daily heat records were set in the last decade (45 of 366 records since 2015).

7.1%

of all-time daily cold records were set in the last decade (26 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1940s
6
1
1950s
76
17
1960s
41
80
1970s
23
71
1980s
47
88
1990s
34
47
2000s
49
21
2010s
76
20
2020s
14
21

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1948, the latest in 2026. Period of observation: 1948-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 75.0°F — Jan 24, 1950 -27.0°F — Jan 17, 1977 3.58 in — Jan 3, 1950
February 82.9°F — Feb 15, 2018 -20.9°F — Feb 10, 1982 4.48 in — Feb 2, 1986
March 89.1°F — Mar 21, 1997 -8.0°F — Mar 5, 1978 2.68 in — Mar 19, 2008
April 91.0°F — Apr 14, 2006 18.0°F — Apr 8, 2007 4.58 in — Apr 29, 1996
May 97.0°F — May 26, 1953 28.0°F — May 4, 1976 4.57 in — May 17, 1995
June 106.0°F — Jun 28, 2012 37.9°F — Jun 1, 1972 8.15 in — Jun 15, 1957
July 109.9°F — Jul 14, 1954 43.0°F — Jul 6, 1972 3.93 in — Jul 28, 1979
August 105.1°F — Aug 15, 2007 39.0°F — Aug 29, 1986 4.00 in — Aug 12, 2020
September 102.9°F — Sep 5, 1954 26.1°F — Sep 23, 1995 4.17 in — Sep 8, 2018
October 96.1°F — Oct 1, 2019 19.0°F — Oct 17, 2024 3.45 in — Oct 30, 2009
November 84.0°F — Nov 1, 1950 1.9°F — Nov 8, 1991 4.50 in — Nov 6, 2024
December 77.5°F — Dec 28, 2025 -18.9°F — Dec 22, 1989 3.97 in — Dec 3, 1982

Click a month to see every daily record for that month in Swansea.